摘要
钻孔灌注桩基础是目前应用最为广泛的基础形式,现行规范对其竖向承载力计算存在一些疏漏。以桩-土联合结构模型为基础,将桩-土相互作用形象概化为并联弹簧变形分析,确定了桩桩-土间传力模式;分析了桩侧极限摩阻力产生的原因及所谓极值的局限性,并初步验证了试桩中桩侧土软化现象。最后通过案例验证了运用本模型可以对桩径、桩长进行合理选择,避免超长桩的产生。
Bored pile is the foundation most widely used at present,however,there exist some omissions in respect of calculation of its vertical bearing capacity in current code.Herein based on the model of pile-soil joint structure,the pile-soil interaction was generalized into deformation of parallel springs visually to determine the pile-soil load transfer mode;the causes of utmost side resistance of pile and the limitation of the so-called extreme value were analyzed;and the softening of soil on pile side was verified initially in pile test.At last,the model was proved through case studies to make a reasonable choice of pile diameter and length and getting out of the occurrence of supper-long pile in the works.
作者
李晓霞
于伟祥
钟顺元
LI Xiaoxia;YU Weixiang;ZHONG Shunyuan(CCCC Railway Consultants Group Co.,Ltd.,Beijing 100088,China;China Highway Engineering Consultants Corporation,Beijing 100097,China)
出处
《路基工程》
2020年第3期26-30,共5页
Subgrade Engineering
基金
中交铁道设计研究总院有限公司(ZJTDKY-2016-02)。
关键词
钻孔灌注桩竖向承载力
桩-土模型
桩侧极限摩阻力
桩-土间传力模式
桩身变形
vertical bearing capacity of bored pile
pile-soil model
utmost side resistance of pile
pile-soil load transfer mode
pile deformation
